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(4) Press F5 to select the source. If the source is External, use the Ext
Trig/FSK/Burst connector in the rear panel to input the external signal, then skip
ahead to step (5). If you choose Internal, continue to the steps below.
(5) Press F3 to set FSK Rate. The range is 1μHz～100KHz (Internal source only).
(6) Press F4 to set Hop Frequency. The range is 1μHz～25KHz.
Term Explanation
FSK Rate:
The frequency at which the output frequency shifts between the carrier frequency and
the Hop frequency (Internal Modulation only).
PWM (Pulse Width Modulation)
The modulated waveform consists of two parts: the Carrier Waveform and the Modulating
Waveform. PWM can only be used for pulse modulation, so the Carrier Waveform must
be Pulse. In PWM, the width of the Carrier Waveform (Pulse) varies with the
instantaneous voltage of the modulating waveform. The user interface of the PWM is
shown as below.
Load
Width
Mod Type
Mod Shape
Source
Carrier Waveform
How to set the parameters of PWM
(1) Press Mod function button to enter the Modulation mode.
(2) Press F1 to switch Mod Type to PWM. If the Carrier Waveform is not Pulse, the
system will switch it to Pulse automatically.
(3) Press
button to display the waveform and parameters of the Carrier
Waveform. You can change the parameters, please refer to "To Output Pulse Signals"
on P14. Press
Modulating
Current Parameter
Carrier
Amplitude
Figure 5-18: The User Interface of PWM
button again to return to the Modulation mode interface.
Frequency
Carrier
Frequency
24
Modulating Waveform
Carrier Waveform
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